Hervé,
Your explanation of the problem is clear; you misunderstood the advice you were given.
Bert wanted you to check your version of the *VM*, not the *image*. They have very similar, but unrelated, version numbers.
If you downloaded Squeak from http://squeak.org/Download, the VM you will have is probably 3.9.
Try going to http://www.squeakvm.org/unix/ to get the very latest VM as Bert recommended.
Cheers, Michael
I use squeak 3.10.1 http://distfiles.gentoo.org/distfiles/Squeak-3.10-1.src.tar.gz. Is it the latest?
Too, I use the image https://gforge.inria.fr/frs/download.php/5550/sq3.10.2-7179web08.08.1.zip.
Cheers
Hervé Darce